Open stream to read output of shell command

ls.c

#include <stdio.h>

/* Inspired by: https://hackaday.com/2022/03/16/linux-fu-simple-pipes/ */
int main() {
  // creates a pipe between calling pgm & executed command (`ls`) and
  // returns a stream to read from the pipe
  FILE* pipe = popen("ls -l", "r");

  // read the output of shell command from stream
  char buffer[64];
  while (!feof(pipe)) {
    char* ret = fgets(buffer, 64, pipe);
    if (ret != NULL) {
      printf("buffer: %s", buffer);
    }
  }

  pclose(pipe);

  return 0;
}